Proof theory is an entire course in itself. I'm afraid it is not possible to replicate that material (and the weeks of course instruction) in a simple forum posting. Sorry!

For a quickie review, you can try online resources such as the Math Forum. But otherwise you're going to need to post a specific question, complete with its instructions, and a clear listing of your steps and reasoning so far, in order for people to be able to try to help you.